With respect, my comments on icing are based on actual experience flying the airplane for 6 years, in some of the nastiest icing conditions the plane could handle. Caravans are well known for having plenty of unprotected surfaces that can accumulate all kinds of nasty looking shapes. The drag produced by them can easily overwhelm the available power of the engine to maintain flight. The forward surface of the cargo pod is a perfect example, even though there is some protection on it.